Cylindrical counterbore

A cylindrical counterbore is a cutting tool with pilot, which is used for processing cylindrical cavities for screw heads. The most typical are counterbores for orifice deepening. Using them, one can obtain orifices of the 4th degree of finish, within accuracy grades 3 – 5. Usually, a cylindrical counterbore consists of cutting teeth, the main or the guiding part and a shank.

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